Nick Briggs e957e331c4 Lock X updates for all systems and lock around X cleanup at exit (#391) ...

* Lock X updates for all systems and lock around X cleanup at exit

All systems which could generate I/O interrupts on the X file descriptor need
to have locking enabled, or there is a high probability that the X library
will deadlock. This requirement may be removed in the future with restructuring
of the way that the interrupt driven I/O is handled.

Ensure that the appropriate XLOCK/XUNLOCK is done around the X window
closing code.

* Also lock X updates when building with CMake.

2021-08-26 16:29:10 -07:00

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